What exactly has been fixed?
When I upgraded to Sonoma a few months ago, I found that I could no longer print from my remote installation of QuickBooks Pro, which is hosted on a remote server run by Apps4Rent. I downloaded MRD Beta 10.9.4. I was then able to print reports and checks on my local printer (as I had for many years) using QuickBooks Pro running at Apps4Rent.
And in what program?
I was running MRD 10.9.6 which stopped allowing printing when I upgraded to Sonoma.
As noted, I am now running MRD 10.9.4 Beta.
QuickBooks Pro 2021 is the application on the remote server from which I am printing on my local printer.
What exactly «It still does not work on anything older»?
Are you talking about the program Microsoft Remote Desktop? If so, it has been fixed so that the latest version does not work correctly.
I do not know if I can print from the most recent version of MRD. I do not have the time to research all versions. MRD Beta 10.9.4 works for me.